Does it come with any maual for setting up? at the beginning?. I don´t know if it is necessary a memory card to do backups of the system, or it will be enough with the Hard Drive. One of the first things I wanna do is to do a first backup in case i do something wrong and the box stay unstable.
Yes it has a basic manual and yes you can back up before updating. You can use USB sticks or drives to externally back up.
The manual doesn't cover anything other than standard stuff for obvious reasons.